ENHANCEMENT OF POWER FLOW IN TRANSMISSION SYSTEM USING UPFC

electrical engineering

In this paper the power flow enhancement has done by mitigating power quality issues by using the custom power devices like Unified Power Quality Control (UPFC). The UPFC consists of combination of series and shunt active filters. Series filter inject voltage which gets added at the point of common coupling and hence the voltage at the load end gets unchanged with the voltage disturbances. Shunt active filter compensates the load reactive power demand and hence mitigates the harmonics from supply current and also maintains the DC link voltage. Unified power quality conditioner (UPFC) is one modern device which deals with voltage and current imperfections simultaneously. In steady state, the real power demand of the series converter is supplied by the shunt converter of the UPFC. To avoid instability/loss of DC link capacitor voltage during transient conditions, a new real power coordination controller has been designed. The need for reactive power coordination controller for UPFC arises from the fact that excessive bus voltage (the bus to which the shunt converter is connected) excursions occur during reactive power transfers. A new reactive power coordination controller has been designed to limit excessive voltage excursions during reactive power transfers. In this paper, an attempt has been made to model the UPFC for voltage and current compensation with the help of two different control schemes. The current and voltage harmonics as well as voltage sag and swells compensation are analyzed MATLAB/SIMULINK software.

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